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Hi Bill,
When you say "No matter which way I swing the mount it seems to make little or no difference to the drift" is the drift always in the same direction?
My gut feel (as JohnH is suggesting) is that you are initially pointing at magnitic South and not true South. Consequently, you will have to make a large adjustment in azimuth in order to become aligned. You are probably making small adjustments around magnetic South and not seeing much difference.
Hope this helps.
Have fun,
Doug
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